Update issue #113 : GraphEdit style options for auto arrange and auto resize to graph
Makes it easier to disconnect all filters in a graph then reconnect them - where auto arrange is not needed and unhelpful 
If auto size to graph is enabled, the window is sized to fit the graph after every rearrangement operation - whether forced or auto

--- The graph is not automatically rearranged if auto arrange is disabled for the following operations
Deleting filters
Connecting pins
Removing pins
Disconnecting pins
Choosing source or sink files
EC_GRAPH_CHANGED graph events

 --- The graph is always rearranged for the following even if auto arrange is disabled
Opening files or adding files to a graph
Connecting to a remote graph
Rendering pins - will create an unpredictable number of filters
Refreshing
Zooming
Changing layout parameters
Changed display as filename option
Duplicating filters
Creating filters - in future could change this so that new filters are created to right of top line or at right location if created from context menu
Adding file source filter or async file source - could be allowed to create at dropped position for drag and drop operations


git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@316 c2f33eb2-41b2-391d-4cb4-d9d0608729ba